Yes, I could test this to figure it out for myself but I am hoping somebody has already done it. The volume control has markings and it is suggested to start at 11 o'clock. That's actually pretty good, but I am wondering how many dbs there are between each marking. For example, if I wanted to raise the output by, say, 6db, how far would I have to advance the control? Alternately, how much would I increase the output if I advanced the control by one mark?

I don't know if there is a difference between Mk 1 & 2. If so, what is the difference? I'm not sure which I have and I'm not at home.

Eh it really depends. 9-10 o'clock is what I would usually recommend with the ULS-15 original. The ULS-15 MK2 is slightly less sensitive. The potentiometer is not really linear, so I can't say that adjusting it a certain way will gain you a fixed dB amount. Really the only way to accurately know is by using a sound level meter.

Hope springs eternal. Guess I'll have to work it out for myself. I have a room null near 30Hz and I should probably lower everything else rather than try to push it up. I've managed to even everything out above 40Hz (+/-2.5db) but the 30Hz dip is still there. Pushing everything above 40Hz down a couple db could be just about perfect. I'll try it when I get home.

The rear is 10hx16w. I built the room so it would expand and, I hoped, reduce the effect of room peaks and nodes.

The front and back walls are parallel and about 25' apart.

The crossover is 80Hz.

I get a peak around 20Hz and 45Hz and a really deep dip around 30Hz. These are all room modes. I also get a very high peak around 200Hz. I have no idea where that comes from.

I got everything pretty smoothed out with FabFilter. I was trying to figure out what to do about the 30Hz dip. One idea was to raise the entire bass range. I decided that might be more trouble than it is worth.

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